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define([
  'summernote/core/list',
  'summernote/core/func',
  'summernote/core/dom',
  'summernote/core/range'
], function (list, func, dom, range) {

  /**
   * @class editing.Bullet
   *
   * @alternateClassName Bullet
   */
  var Bullet = function () {
    /**
     * @method insertOrderedList
     *
     * toggle ordered list
     *
     * @type command
     */
    this.insertOrderedList = function () {
      this.toggleList('OL');
    };

    /**
     * @method insertUnorderedList
     *
     * toggle unordered list
     *
     * @type command
     */
    this.insertUnorderedList = function () {
      this.toggleList('UL');
    };

    /**
     * @method indent
     *
     * indent
     *
     * @type command
     */
    this.indent = function () {
      var self = this;
      var rng = range.create().wrapBodyInlineWithPara();

      var paras = rng.nodes(dom.isPara, { includeAncestor: true });
      var clustereds = list.clusterBy(paras, func.peq2('parentNode'));

      $.each(clustereds, function (idx, paras) {
        var head = list.head(paras);
        if (dom.isLi(head)) {
          self.wrapList(paras, head.parentNode.nodeName);
        } else {
          $.each(paras, function (idx, para) {
            $(para).css('marginLeft', function (idx, val) {
              return (parseInt(val, 10) || 0) + 25;
            });
          });
        }
      });

      rng.select();
    };

    /**
     * @method outdent
     *
     * outdent
     *
     * @type command
     */
    this.outdent = function () {
      var self = this;
      var rng = range.create().wrapBodyInlineWithPara();

      var paras = rng.nodes(dom.isPara, { includeAncestor: true });
      var clustereds = list.clusterBy(paras, func.peq2('parentNode'));

      $.each(clustereds, function (idx, paras) {
        var head = list.head(paras);
        if (dom.isLi(head)) {
          self.releaseList([paras]);
        } else {
          $.each(paras, function (idx, para) {
            $(para).css('marginLeft', function (idx, val) {
              val = (parseInt(val, 10) || 0);
              return val > 25 ? val - 25 : '';
            });
          });
        }
      });

      rng.select();
    };

    /**
     * @method toggleList
     *
     * toggle list
     *
     * @param {String} listName - OL or UL
     */
    this.toggleList = function (listName) {
      var self = this;
      var rng = range.create().wrapBodyInlineWithPara();

      var paras = rng.nodes(dom.isPara, { includeAncestor: true });
      var bookmark = rng.paraBookmark(paras);
      var clustereds = list.clusterBy(paras, func.peq2('parentNode'));

      // paragraph to list
      if (list.find(paras, dom.isPurePara)) {
        var wrappedParas = [];
        $.each(clustereds, function (idx, paras) {
          wrappedParas = wrappedParas.concat(self.wrapList(paras, listName));
        });
        paras = wrappedParas;
      // list to paragraph or change list style
      } else {
        var diffLists = rng.nodes(dom.isList, {
          includeAncestor: true
        }).filter(function (listNode) {
          return !$.nodeName(listNode, listName);
        });

        if (diffLists.length) {
          $.each(diffLists, function (idx, listNode) {
            dom.replace(listNode, listName);
          });
        } else {
          paras = this.releaseList(clustereds, true);
        }
      }

      range.createFromParaBookmark(bookmark, paras).select();
    };

    /**
     * @method wrapList
     *
     * @param {Node[]} paras
     * @param {String} listName
     * @return {Node[]}
     */
    this.wrapList = function (paras, listName) {
      var head = list.head(paras);
      var last = list.last(paras);

      var prevList = dom.isList(head.previousSibling) && head.previousSibling;
      var nextList = dom.isList(last.nextSibling) && last.nextSibling;

      var listNode = prevList || dom.insertAfter(dom.create(listName || 'UL'), last);

      // P to LI
      paras = paras.map(function (para) {
        return dom.isPurePara(para) ? dom.replace(para, 'LI') : para;
      });

      // append to list(<ul>, <ol>)
      dom.appendChildNodes(listNode, paras);

      if (nextList) {
        dom.appendChildNodes(listNode, list.from(nextList.childNodes));
        dom.remove(nextList);
      }

      return paras;
    };

    /**
     * @method releaseList
     *
     * @param {Array[]} clustereds
     * @param {Boolean} isEscapseToBody
     * @return {Node[]}
     */
    this.releaseList = function (clustereds, isEscapseToBody) {
      var releasedParas = [];

      $.each(clustereds, function (idx, paras) {
        var head = list.head(paras);
        var last = list.last(paras);

        var headList = isEscapseToBody ? dom.lastAncestor(head, dom.isList) :
                                         head.parentNode;
        var lastList = headList.childNodes.length > 1 ? dom.splitTree(headList, {
          node: last.parentNode,
          offset: dom.position(last) + 1
        }, {
          isSkipPaddingBlankHTML: true
        }) : null;

        var middleList = dom.splitTree(headList, {
          node: head.parentNode,
          offset: dom.position(head)
        }, {
          isSkipPaddingBlankHTML: true
        });

        paras = isEscapseToBody ? dom.listDescendant(middleList, dom.isLi) :
                                  list.from(middleList.childNodes).filter(dom.isLi);

        // LI to P
        if (isEscapseToBody || !dom.isList(headList.parentNode)) {
          paras = paras.map(function (para) {
            return dom.replace(para, 'P');
          });
        }

        $.each(list.from(paras).reverse(), function (idx, para) {
          dom.insertAfter(para, headList);
        });

        // remove empty lists
        var rootLists = list.compact([headList, middleList, lastList]);
        $.each(rootLists, function (idx, rootList) {
          var listNodes = [rootList].concat(dom.listDescendant(rootList, dom.isList));
          $.each(listNodes.reverse(), function (idx, listNode) {
            if (!dom.nodeLength(listNode)) {
              dom.remove(listNode, true);
            }
          });
        });

        releasedParas = releasedParas.concat(paras);
      });

      return releasedParas;
    };
  };

  return Bullet;
});